Is that under the Restricted Adult Content section of settings?
Provided the settings are saved when you turn them back on, you shouldn't need a retune.
If it still doesn't work, then I suggest a maintenance reset, keep recordings, which will reset all settings including your choice of whether adult channels are on or off and your passcode.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
